TY - JOUR
T1 - Encapsulation of ascorbic acid into calcium alginate matrices through coacervation coupled to freeze-drying
AU - Viveros-Contreras, R.
AU - Téllez-Medina, D. I.
AU - Perea-Flores, M. J.
AU - Alamilla-Beltrán, L.
AU - Cornejo-Mazón, M.
AU - Beristain-Guevara, C. I.
AU - Azuara-Nieto, E.
AU - Gutiérrez-López, G. F.
PY - 2013
Y1 - 2013
N2 - The aim of this work was to study the stability of ascorbic acid (AA) after encapsulation into calcium alginate matrixes by coacervation through: a) falling drop by dipping AA-sodium alginate solutions into CaCl2 solutions (IAA method), and by atomizing the AA-sodium alginate solutions into CaCl2 solutions (SAA method), followed by freeze-drying of the obtained capsules. Sorption isotherms for both types of products were determined at the water activity (aw) range of 0.103-0.892, at 15, 25 and 35°C, by using the gravimetric method with saturated salt. 'The percentage of retentton of AA was determined, after 15, 30, 45 and 60 daye of storage at 25 °C. SEM micrographs of the products were obtained and the volume of micropores was also calculated. The minimum integral entropy of the water molecules occurred at aw = 0.234 in the falling drop method powders, whereas this parameter was observed at aw = 0.706 for the atomised one. For both types of products, the maximum value of AA retention was observed at die aw corresponding to the minimum integral entropy which occurred at higher moisture contents for SAA than for IAA materials.
AB - The aim of this work was to study the stability of ascorbic acid (AA) after encapsulation into calcium alginate matrixes by coacervation through: a) falling drop by dipping AA-sodium alginate solutions into CaCl2 solutions (IAA method), and by atomizing the AA-sodium alginate solutions into CaCl2 solutions (SAA method), followed by freeze-drying of the obtained capsules. Sorption isotherms for both types of products were determined at the water activity (aw) range of 0.103-0.892, at 15, 25 and 35°C, by using the gravimetric method with saturated salt. 'The percentage of retentton of AA was determined, after 15, 30, 45 and 60 daye of storage at 25 °C. SEM micrographs of the products were obtained and the volume of micropores was also calculated. The minimum integral entropy of the water molecules occurred at aw = 0.234 in the falling drop method powders, whereas this parameter was observed at aw = 0.706 for the atomised one. For both types of products, the maximum value of AA retention was observed at die aw corresponding to the minimum integral entropy which occurred at higher moisture contents for SAA than for IAA materials.
KW - Ascorbic acid
KW - Encapsulation
KW - Minimum integral entropy
KW - Storage ttability
KW - Water sorption
UR - http://www.scopus.com/inward/record.url?scp=84876767302&partnerID=8YFLogxK
M3 - Artículo
SN - 1665-2738
VL - 12
SP - 29
EP - 39
JO - Revista Mexicana de Ingeniera Quimica
JF - Revista Mexicana de Ingeniera Quimica
IS - 1
ER -